Question

Adding the colums works, but i am stuck when i want to add the data of the columns stored in a mysql database to the jtable. it ask for a object vector[][] but i have no clue what to give

Connection con;
DefaultTableModel model = new DefaultTableModel();

public Hoofdscherm() {
    initComponents();
    uitvoerSpelers.setModel(model);

    try {
        con = DriverManager.getConnection("jdbc:mysql://localhost/fullhouse", "root", "hamchi50985");

        // selecteer gegevens uit fullhouse.speler tabel
        PreparedStatement stat = con.prepareStatement("SELECT * FROM fullhouse.speler");

        // sla deze GEGEVENS op in een resultset
        ResultSet resultaat = stat.executeQuery();

        // haal alle kolomnamen op PUUR VOOR DE MODEL VAN JTABLE 
        ResultSetMetaData data = resultaat.getMetaData();

        String[] colum = new String[15];
        for (int i = 1; i < data.getColumnCount(); i++) {
            colum[i] = data.getColumnName(i);
            model.addColumn(colum[i]);
            while (resultaat.next()) {
                Object[] gegevens  = new String[] {resultaat.getString(1)};
                model.addRow(gegevens[0]);
            }
        }    
    } catch (SQLException ex) {
        JOptionPane.showMessageDialog(null, ex);
    }
}

Answer 1

I think you need something like this.

Note
1. Also add your columns separate to resultset data. Like I showed in my code below.

Vector<String> rowOne = new Vector<String>();
rowOne.addElement("R1C1");
rowOne.addElement("R1C2");

Vector<String> rowTwo = new Vector<String>();
rowTwo.addElement("R2C1");
rowTwo.addElement("R2C2");

Vector<String> cols = new Vector<String>();

Vector<Vector> vecRow = new Vector<Vector>();
vecRow.addElement(rowOne);
vecRow.addElement(rowTwo);
cols.addElement("Col1");
cols.addElement("Col2");
JTable table = new JTable(vecRow, cols);

Edit

For you convenience and requirement You can follow code structure below.

 Vector<String> rows = new Vector<String>();
 Vector<Vector> dBdata = new Vector<Vector>();

// Add Columns to table
for (int i = 1; i < data.getColumnCount(); i++) {
    colum[i] = data.getColumnName(i);
    model.addColumn(colum[i]);
}

while (resultaat.next()) {
    // add column data to rows vector
            // Make sure that all data type is in string because of generics
    rows.add(resultaat.getString("columnName1"));
    rows.add(resultaat.getString("columnName2"));
    rows.add(resultaat.getString("columnName3"));

    // add whole row vector to dBdata vector
    dBdata.addElement(rows);
}
model.addRow(dBdata);

Vector implements a dynamic array. It is similar to ArrayList, but with two differences:

1. Vector is synchronized.

2. Vector contains many legacy methods that are not part of the collections framework.

Class Vector Javadoc

I hope this will help you.